New and rare hoverflies for the Dutch fauna (Diptera: Syrphidae).Paragus albifrons (Fallén), P. bicolor (Fabricius), Sphegina verecunda Collin, Neoascia annexa (O.F. Müller), Callicera aenea (Fabricius), Cheilosia caerulescens (Meigen), C. chloris (Meigen), C. flavipes (Panzer), Chamaesyrphus scaevoides (Fallén), Xylota coeruleiventris Zetterstedt, Merodon rufus Meigen and Eristalis picea (Fallén) are recorded with full details for the first time from The Netherlands. Some of these species have been listed by other authors but without any details. Here additional notes are given on the distribution and biology of these twelve species as well as 49 other more or less rare species.